<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="请输入访问的网址">
<input type="button" value="访问" onclick="f1()">
<input type="button" value="三秒后访问" onclick="f2()">
<input type="button" value="刷新" onclick="f3()">
<script>
  let i = document.querySelector("input");
  function f1() {
    location.href = i.value;
  }
  function f2(){
    setTimeout(function (){
      location.href = i.value;
    },3000);
  }
  function f3(){
    location.reload();
  }





</script>



</body>
</html>